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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands, $ in Millions	3 Months Ended				9 Months Ended
	Jul. 31, 2017 USD ($)	Apr. 30, 2017 USD ($)	Oct. 31, 2016 USD ($) $ / shares shares	Oct. 31, 2016 CAD ($) shares	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)	Oct. 17, 2016 USD ($) $ / shares	Oct. 14, 2016 $ / shares
Payments to Acquire Businesses, Net of Cash Acquired					$ 1,356	$ 512,348
Stowe [Member]
Business Acquisition, Effective Date of Acquisition	Jun. 07, 2017
Business Combination, Consideration Transferred	$ 40,700
Whistler Blackcomb [Member]
Shares Purchased to Acquire Business | shares			38,500,000	38,500,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares			3,746,000	3,746,000
Business Acquisition, Effective Date of Acquisition			Oct. 17, 2016	Oct. 17, 2016
Noncontrolling Interest, Ownership Percentage by Parent							75.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners							25.00%
United States of America, Dollars | Whistler Blackcomb [Member]
Business Combination, Consideration Transferred			$ 1,087,203
Business Acquisition, Share Price | $ / shares			$ 13.31
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		$ 229,700
Business Combination, Consideration Transferred			$ 512,558
Business Combination, Consideration Transferred, Other			4,308
Total Estimated Purchase Consideration							$ 1,272,314
Realized Investment Gains (Losses)			800
Payments to Acquire Businesses, Gross			509,200
Foreign Currency Transaction Gain (Loss), Realized			$ 3,400
Business Acquisition, Transaction Costs		$ 3,200
Share Price | $ / shares								$ 153.41
Canada, Dollars | Whistler Blackcomb [Member]
Business Acquisition, Share Price | $ / shares							$ 17.50
Business Combination, Consideration Transferred				$ 673.8
Common Stock [Member] | Whistler Blackcomb [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares			3,327,719	3,327,719
Exchangeable Shares [Member] | Whistler Blackcomb [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares			418,095	418,095

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